Python中枚举的常见做法是什么？

from enum import Enum

class Color(Enum):
    RED = 1
    GREEN = 2
    BLUE = 3

from collections import namedtuple

Color = namedtuple('Color', ['RED', 'GREEN', 'BLUE'])(_enumerate('Color', 'RED GREEN BLUE'))

def color_constants():
    RED = 1
    GREEN = 2
    BLUE = 3
    return {RED: RED, GREEN: GREEN, BLUE: BLUE}

Color = color_constants()